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  <p>
    Reports unused parameters.
  </p>
  <p>
    A parameter is considered as unused if it is
    set (by invocation expressions or script value expressions)
    or checked (by parameter condition expressions),
    but not used (in, such as, definition declarations).
  </p>
  <p><b>Example:</b></p>
  <pre>
# some_script_file.txt
some_definition = {
    some_prop = $PARAM$ # used
    [[UNUSED_PARAM] # checked but not used
        some_other_prop = $PARAM$
    ]
}

# some_other_script_file.txt
some_other_definition = {
    some_definition = {
        UNUSED_PARAM = value # set but not used
    }
    some_sv_prop = value:some_sv|UNUSED_PARAM|value| # set but not used
}</pre>
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